The Sun must have left its birth cluster within about 20 Myr after the giant planets settled into their orbits, or the outer Oort cloud would be nearly absent today.
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Oort Cloud Ecology. III. The Sun left the parent star cluster shortly after the giant planets formed
The Sun must have left its birth cluster within about 20 Myr after the giant planets settled into their orbits, or the outer Oort cloud would be nearly absent today.